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Transcriptional Repression of the Neurofibromatosis-1 Tumor Suppressor by the t(8;21) Fusion Protein

机译:t(8; 21)融合蛋白对神经纤维瘤病1肿瘤抑制子的转录抑制

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Von Recklinghausen's disease is a relatively common familial genetic disorder characterized by inactivating mutations of the Neurofibromatosis-1 (NF1) gene that predisposes these patients to malignancies, including an increased risk for juvenile myelomonocytic leukemia. However, NF1 mutations are not common in acute myeloid leukemia (AML). Given that the RUNX1 transcription factor is the most common target for chromosomal translocations in acute leukemia, we asked if NF1 might be regulated by RUNX1. In reporter assays, RUNX1 activated the NF1 promoter and cooperated with C/EBPα and ETS2 to activate the NF1 promoter over 80-fold. Moreover, the t(8;21) fusion protein RUNX1-MTG8 (R/M), which represses RUNX1-regulated genes, actively repressed the NF1 promoter. R/M associated with the NF1 promoter in vivo and repressed endogenous NF1 gene expression. In addition, similar to loss of NF1, R/M expression enhanced the sensitivity of primary myeloid progenitor cells to granulocyte-macrophage colony-stimulating factor. Our results indicate that the NF1 tumor suppressor gene is a direct transcriptional target of RUNX1 and the t(8;21) fusion protein, suggesting that suppression of NF1 expression contributes to the molecular pathogenesis of AML.
机译:冯·瑞克林豪森氏病是一种相对常见的家族遗传病,其特征是神经纤维瘤病- 1 NF1 )基因的失活使这些患者易患恶性肿瘤。 ,包括增加青少年骨髓单核细胞白血病的风险。但是, NF1 突变在急性髓细胞性白血病(AML)中并不常见。鉴于RUNX1转录因子是急性白血病中染色体易位的最常见靶标,我们询问 NF1 是否受RUNX1调控。在报告基因检测中,RUNX1激活了 NF1 启动子,并与C /EBPα和ETS2协同作用,将 NF1 启动子激活了80倍以上。此外,抑制RUNX1调控基因的t(8; 21)融合蛋白RUNX1-MTG8(R / M)积极抑制了 NF1 启动子。 R / M在体内与 NF1 启动子相关,并抑制内源性 NF1 基因表达。此外,与 NF1 的丢失相似,R / M表达增强了原代骨髓祖细胞对粒细胞-巨噬细胞集落刺激因子的敏感性。我们的结果表明, NF1 肿瘤抑制基因是RUNX1和t(8; 21)融合蛋白的直接转录靶标,提示 NF1 表达的抑制有助于肿瘤的发生。 AML的分子发病机制。

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